package com.tyj.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.tyj.common.to.es.SkuEsModel;
import com.tyj.common.utils.R;
import com.tyj.gulimall.search.config.GulimallElasticSearchConfig;
import com.tyj.gulimall.search.constant.EsConstant;
import com.tyj.gulimall.search.feign.ProductFeignService;
import com.tyj.gulimall.search.service.SearchService;
import com.tyj.gulimall.search.vo.AttrVo;
import com.tyj.gulimall.search.vo.SearchParam;
import com.tyj.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;

    /**
     * 准备检索请求
     * #模糊匹配,过滤(按照属性,分类,品牌,价格区间,库存),排序,分页,高亮,聚合分析
     *
     * @param param
     * @return
     */
    @Override
    public SearchResult listPage(SearchParam param) {
        //1 动态构建出查询需要的DSL语句
        SearchResult result = null;
        //2 准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(param);
        try {
            //2.1 执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //2.2 分析响应数据 封装成我们需要的格式
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> skuEsModels = new ArrayList();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                //高亮需要再次获取 不能从结果获取
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                skuEsModels.add(skuEsModel);
            }
        }
        result.setProduct(skuEsModels);
        //2.商品的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //得到属性id
            long attrId = bucket.getKeyAsNumber().longValue();
            //得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //得到属性的值
            List<String> attr_value_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attr_value_agg);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3.商品所涉及到的品牌息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            //得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVo.setBrandName(brandName);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4.商品分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            //得到分类id
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名字
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        =============以上为聚合信息

        //5.分页信息 页码
        result.setPageNum(param.getPageNum());
        //6.分页信息 总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7.分页信息 总页码
        int totalPages = total % EsConstant.Product_PAGESIZE == 0 ? (int) (total / EsConstant.Product_PAGESIZE) : (int) (total / EsConstant.Product_PAGESIZE + 1);
        result.setTotalPages(totalPages);
        //存放分页数量 利于前端遍历
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //构架面包屑导航数据
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
//            attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.info(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrVo data = r.getData("attr", new TypeReference<AttrVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2. 取消面包屑后跳转到指定路径
                //拿到所有的查询条件,去掉当前
                String encode = null;
                try {

                    encode = URLEncoder.encode(attr, "UTF-8");
                    encode = encode.replace("+", "%20"); //前端数据差异化处理 空格符号
                    //attr=13_HUAWEI nova 8 Pro
                    //encode=13_HUAWEI%20nova%208%20Pro
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                String replace = param.get_queryString().replace("&attrs=" + encode, "");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }


        return result;
    }

    /**
     * 准备检索请求
     *
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句
        /**
         * 模糊匹配,过滤（"按照属性,分类,品牌,价格区间,库存")
         */
        //1构建 boolQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 filter  按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.3 filter 按品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }

        //1.4 filter 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = new BoolQueryBuilder();
                String[] s = attr.split("_");
                String attrId = s[0]; //属性id
                String[] attrValue = s[1].split(":"); //属性值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValue));
                //注意每一个必须生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //1.5 Filter 按照库存查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.6 filter 按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            //格式为 1_500/ _500 /500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        sourceBuilder.query(boolQuery);


        /**
         * 排序  分页 高亮
         */
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            //sort=hotScore_asc/desc .....
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        //2.2 分页
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.Product_PAGESIZE);
        sourceBuilder.size(EsConstant.Product_PAGESIZE);

        //2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }


        /**
         * 聚合分析
         */
        //3.1 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        //3.1.1品牌聚合子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //3.2.1 分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        //3.2.2 分类自聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.3.1 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //3.3.2子聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //3.3.3再次子聚合 attr_id 与 attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        //封装聚合
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String string = sourceBuilder.toString();
        System.out.println("构建的DSL=" + string);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCR_INDEX}, sourceBuilder); //
        return searchRequest;
    }
}
